Corporation Tax Returns and Planning for UK Limited Companies
Accurate CT600 filing, every relief claimed, filed on time with HMRC.
Corporation tax rules are complex and the penalties for getting them wrong are real. At WPC Accountants, we handle the whole job for UK limited companies, from calculating your taxable profits to claiming every relief you are entitled to and filing your CT600 on time. The result is a correct return, a lower bill where the law allows and no last-minute panic.
Why choose WPC Accountants for corporation tax
Accurate CT600 computations
Correct figures the first time, so you reduce the risk of an HMRC enquiry.
Tax-efficiency strategies
We legally reduce your bill using reliefs such as capital allowances, R&D relief and loss relief.
Deadline management
We track your dates and file ahead of the 12-month deadline, so you avoid fines.
Up-to-date compliance
We keep pace with changing tax law, so your return reflects the current rules and rates.
Fixed-fee pricing
Clear, upfront costs with no surprises.
Our corporation tax services
Corporation Tax return (CT600) preparation
We handle the whole process, from computing your taxable profits to submitting the return to HMRC.
- Calculating taxable profits by adjusting your accounting profits for tax
- Claiming allowable deductions, including capital allowances and business expenses
- Submitting your CT600 to HMRC
- Providing a copy for your records
Tax planning and liability reduction
We help you claim every relief that fits your business so your bill is as low as the law allows.
- Annual Investment Allowance (AIA), giving 100% relief on qualifying equipment up to £1 million a year
- Research and Development (R&D) relief on qualifying innovation costs
- Marginal Relief for profits between £50,000 and £250,000
- Loss relief, carrying trading losses back or forward to reduce tax
Payment and HMRC correspondence
We keep you on the right side of HMRC from the payment date onwards.
- Paying the right amount at the right time
- Responding to HMRC enquiries and queries on your behalf
- Forecasting future tax bills for your cash flow planning
Late filing and penalty help
Missed a deadline? We step in to minimise the damage and get you back on track.
- File overdue CT600 returns
- Deal with HMRC on penalties and interest charges
- Put systems in place so it does not happen again
Current UK corporation tax rates
The rates below apply to the financial year starting 1 April 2025. Marginal Relief eases the jump between the two rates for profits in the middle band.
| Profit level | Rate | Notes |
|---|---|---|
| Up to £50,000 | 19% (small profits rate) | For companies with lower profits. |
| £50,000 to £250,000 | Between 19% and 25% | Marginal Relief tapers the rate across this band. |
| Over £250,000 | 25% (main rate) | The full main rate applies. |
Key corporation tax deadlines
Note that the payment deadline comes before the filing deadline. Larger companies may pay in quarterly instalments. We manage both dates for you.
| What | When |
|---|---|
| Pay your corporation tax | 9 months and 1 day after the end of your accounting period |
| File your Company Tax Return (CT600) | 12 months after the end of your accounting period |
How our corporation tax process works
- 1
Initial review
We analyse your figures and spot tax-saving opportunities before we start.
- 2
Data collection
Secure submission of your accounts, profit and loss and expense records.
- 3
Computation and filing
We prepare and submit your CT600 to HMRC with all reliefs claimed.
- 4
Payment advice
Clear guidance on exactly how much to pay and when, so you are never caught short.
- 5
Ongoing support
Year-round planning conversations to keep future bills as low as possible.
Corporation tax for every kind of company
Start-ups
First-year companies getting their CT obligations right from day one.
Established SMEs
Growing limited companies with more complex reliefs and planning needs.
Sponsor-Licence Holders
Companies with payroll and compliance obligations tied to their tax position.
Simple, Fixed Pricing
We work on clear, fixed fees based on the size and complexity of your company, so you know the cost upfront. Book a free consultation for a straightforward quote with no hidden extras.
Book a free consultationNo obligation · Fixed fees · No hourly surprises
Who we handle Corporation Tax for
Construction and CIS
Corporation Tax for construction companies, including CIS deductions suffered.
Non-Resident Bangladeshis
UK companies owned from Bangladesh, filed and planned from here.
Frequently asked questions
- Corporation tax is the tax a limited company pays on its profits, including trading profits, investment gains and the profit on selling assets. UK limited companies pay it. Sole traders and ordinary partnerships do not; they pay income tax through Self Assessment instead.
- For the financial year starting 1 April 2025, the small profits rate is 19% for profits up to £50,000 and the main rate is 25% for profits over £250,000. Profits in between are taxed with Marginal Relief, which tapers the rate. Check the current figures on GOV.UK, as rates can change at a Budget.
- You pay your corporation tax 9 months and 1 day after the end of your accounting period, and you file your Company Tax Return (CT600) within 12 months of the period end. The payment deadline comes first, which surprises many company owners.
- By claiming every relief you are entitled to, such as capital allowances on equipment, the Annual Investment Allowance, R&D relief on qualifying innovation and loss relief. Good planning during the year usually saves more than a rushed return at the deadline.
- HMRC charges an automatic penalty for a late return, which increases the longer it is outstanding, and interest runs on tax paid late. If you have already missed a deadline, we can file the overdue return and deal with HMRC on the penalties.
Get in Touch
Contact Details
Address
3rd Floor, 112-116 Whitechapel Road, London, E1 1JE
Phone
+44 7380 992174Office hours
Monday to Friday, 10:00 am to 6:30 pm